Journal of Jilin University(Engineering and Technology Edition) ›› 2020, Vol. 50 ›› Issue (5): 1876-1885.doi: 10.13229/j.cnki.jdxbgxb20190484

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Temporal and spatial distribution of incident sound field with low frequency in shallow water

Ling-guo ZHU1,2(),An-bang ZHAO1(),Bao-shan YANG2,Zhong-cheng MA2,3,Wen-zhang LIU2,Liang-hao LYU2   

  1. 1.College of Underwater Acoustic Engineering, Harbin Engineering University, Harbin 150001, China
    2.First Research Laboratory, Dalian Scientific Test & Control Technology Institute, Dalian 116013, China
    3.Echo Research Laboratory, Science and Technology on Underwater Test and Control Laboratory, Dalian 116013, China
  • Received:2019-05-20 Online:2020-09-01 Published:2020-09-16
  • Contact: An-bang ZHAO E-mail:13478663345@163.com;zhaoanbang@hrbeu.edu.cn

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Abstract:

Based on the normal mode theory, the spatial–temporal correlation, sound field structure and DOA characteristics of the incident sound field in the range of different sonar distances in shallow water channel are numerically analyzed. The receiver model is established according to the receiving model of the underwater target’s incoming sound field. The experiment of the spatial-temporal correlation characteristics of the incoming sound field in typical sonar frequency band is carried out. Theoretical and experimental studies show that the long-range wave sound field is mainly composed of low order simple positive waves, which approximates the horizontal incident in the vertical plane. The low frequency sound field has obvious time and space stability, and can predict the incident sound field.

Key words: underwater target, incident sound field, space-time distribution, shallow water channel

CLC Number: 

  • TB567

Fig.1

Spatial distribution of incident sound field at different distances"

Fig.2

Distance 10 km, total energy ratio of low order simple positive wave"

Fig.3

Distance 30 km, total energy ratio of low order simple positive wave"

Fig.4

Distance 60 km, total energy ratio of low order simple positive wave"

Fig.5

Analysis of arrival structure of incident sound field"

Fig.6

Horizontal longitudinal correlationcoefficient(1000 Hz)"

Fig.7

Vertical correlation coefficient(1000 Hz)"

Fig.8

Equivalent receiving model of incident sound field"

Fig.9

Situation chart of receiving sound field test"

Fig.10

Received signals at different distances"

Fig.11

Horizontal longitudinal correlation coefficient of different aperture"

Fig.12

Vertical correlation coefficient of different aperture"

Fig.13

Time stability of incident sound field(different positions)"

Fig.14

Signal variance of incident sound field(different positions)"

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